Inflating valve



Oct. 12, 1937. I A. J. BOYD 2,095,912

INFLATING VALVE Filed Feb; 27, 1937 2 Sheets-Sheet 2 V ZZ Invent?- m 9 via few a/ Aiiorneys Patented Oct. 12, 1937 UNITED STATES PATEN'l" OFFICE 2 Claims.

The present invention relates to new and use-..

is to provide an inflating valve of the afore-men- Other objects of the-invention are to provide an inflating valve of the character described which will be comparatively simple in construc-. I

All of the foregoing and still further objects and flating valve constructed in accordance with the present invention mounted in a rubber inner tube stem, said stem being shown in section.

Figure 2 is a view in vertical section through the invention.

Figure 3 is a detail view partially in elevation and partially in section of the air retaining valve.

Figure 4 is an elevational view, looking at the lower or inner end of the invention.

Figure 5 is a detail view in cross section through the valve which excludes dirt, water and other foreign matter.

Referring now tothe drawings in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a substantially tubular casing I of suitable metal which is adapted to be vulcanized in a conventional rubber stem 2 of an inner tube 3 in a manner to project beyond the free end of said stem, as illustrated to advantage in Fig. 1 of the drawings. At

an intermediate point, the tubular casing I is formed to provide an external shoulder 4 which abuts the free end of the rubber stem 2.

(In the upper end portion of the casing I is a. chamber 5 which is tapered in the manner shown to advantage in Fig. 2 of the drawings. The chamber 5 includes a reduced lower portion 6. The upper end of the casing I is turned inwardly in a manner to provide a seat I.

In the lower portion of the casing I is a chamher 8 into the lower end portion of which a ring 9 is threaded. The ring 8 is provided with aligned grooves I0 in its lower end for receiving a suitable tool, such asa screw driver. At an intermediate point the casing I is provided with a comparatively small bore 'II establishing communication between the chambers 5 and 8. The lower por tion of the bore II is tapered in a manner to pro- .vide a substantially conical valve seat I2.

Engageable with the seat I2 is a substantially onical rubber air retaining valve I3 on the lower 2nd of a stem I4. The air retaining valve I3 includesa metallic core I5 which is an integral part of the stem I4. The stem I4 extends upwardly through the bore II and the chamber 5 and projects slightly beyond the upper end of the casing I; when the valve I3 is closed, and terminates in a flared head I6. A coil spring I1 is mounted in the chamber 8 and has one end engaged with the ring 9 and itsother end engaged with the valve 13 for yieldingly urging said valve toward the seat I2.

Slidably moun'tedon the stem I4 and operable in the chamber 5 is a foreign matter excluding valve I8 which is engageable with the seat I. A coil'spring I9 encircles the stem I4 and has one end engaged with the bottom of the reduced portion 6 of the chamber 5 and its other end engaged beneath the foreign matter excluding valve II! for yieldingly urging said valve toward the seat I. The'valve I8 includes a substantially rounded upper portion 20 which protrudes beyond the seat I and the upper end of the casing I. Also, the upper portion of the bore 2I of the valve I8 which accommodates the stem I4 is flared for the reception of the substantially correspondingly shaped head I6 of said stem I4.

It will thus be seen that an inflating valve has been provided which will retain air for a comparatively long time with little loss from leakage due, to a considerable extent, to the fact that substantially all foreign matter will be excluded at all times. The valve I3, when the tire is inflated, is maintained in engagement with the seat I2 by the air pressure and, of course, the greater the pressure the tighter said valve will be seated. when the tire or tube is deflated the spring ll maintains the valve it in engagement with the seat It. In assembling the'device valve 'II and thespring I! are inserted in I after which this end of the casing I is turned to form the seat 1. The stern/II with the valve II are then inserted irony theglower end of the casing I, the spring l! is inserted in the chamber [behind thev'alve it, aiterwhich-the ring I is inserted and adjusted as desired to regulate the tensionfof said spring H. The lower end portion of the casing I is then squeezed orgrooved. *as.at 22, or otherwise slightly distorted in a manner to permanently secure the ring I in adjusted position. The device is then ready to be vulcanized in the rubbertubesteml. Aspreviously stated, the valve It prevents the entrance of foreign matter and its substantially rounded, protruding portion '20 will have a tendency to cause any foreign matter that may collect thereon to be blown away when the hassle of an air hose is applied. Of course, when the tire is being inflated thevalve II is unseated against the tension of the spring I! and the valve It is unseated against the tension ofthe spring II. The casing l is of; rugged construction to withstand harduseandtoresistdamageshmildapuncture or blowout occur. A projection 22' depends from the core I5 for retaining the upper end of the spring ll in position. 7

It 'is believed that the many advantages of a tire inflating valve constructed in accordance with the present invention will be readily understood and although a preferred embodiment ot the device is as illustrated and described. it is'to 'beunderstoodthatchangesintbedetailsof inghavingcharnbersinitsendpou-ticns,said

casingfurther tvingalongitudinalboreeltendingbetweenthecmmbersmnemdportion of said bore being substantially conical for providing a valve seat, a substantially conical valve member engageable with the seat, a ring threadedly mounted in one of the chambers, a coil spring mounted in said one chamber and having one end engaged with the ring and its other end engaged with the valve member for yieldingly urging said valve member toward the seat, said valve member including an integral stem ex- -member including a substantially rounded protuberance projecting from said one end of the casing, saidsecond named valve member having a bore therein accommodating the stem, one end portion of the second named bore being enlarged for the snug reception of the head, and a coil spring mounted in said other chamber and encircling the stem and engaged with the second named valve member for yieldingly urging the same toward the second named seat.

2. A valve of the class described comprising a casing of elongated form and of one piece of material and having a chamber in each end opening out through said end ands. bore connectin chambers together and one end of the bore shaped to provide a val seat, a valve engaging the seat and having a 'stem passing through one chamber and projecting from the casing and having its extremity enlarged and tapered inwardly,'the end of the casing through which the stem projects being formed to provide an internal valve seat, a valve'engaging the seat and having an opening therein for the e of the stem, the outer end of the opening being enlarged and flared to engagetm tapered head of the stem, a spring for holding the said last-mentioned valve on its seat, a spring in the other chamber for holding the first-mentioned valve on its seat and means for holdingthe last-mentioned spring in thechamber.

ANDREW J. BOYD. 

